Improved machete foe cutting down augebs



E. O. & E'. CAR RINGTON. MACHINE FOR CUTTING DOWN AUGERS.

No. 66,297. Patented July 2, 1867;

gotten giants get rut @ffirh E.-O. CARRINGT'ON AND EDWIN C-ARRINGTON, OFWLAIiLINGFORD, CON.-

' NECTICUT.

Letters Patent N0.:66,297, dated July 2, 1867.

Iurnovnn MACHINE FOB. cnrrnrc DOWN Acorns.

To ALL WHOM IT MAY cononnn:

' Be it known that we, EJO. Cennmcros and E. Cnnurncroir, ofWallingford, inthe county of New Haven and State of Connecticut,-haveinvented a new Machine for Cutting Down Angers; and we do hereby declarethe following, when taken in connection with the accompanying drawings,and the lettersof reference marked thereon, to be .a full, clear, andexact description of the same, and which said drawings constitute partof this specification, and represent, in-- l Figure 1, a' top view.

a figure 2, a frontview.

Figure 3, a sectional view on line a: x, and in I Figure 4 thesamesection in difi'erent position to illustratethe operation.

This invention is designed .to form the lip of auger'bibs by mechanicalmeans, which has heretofore been done by hand, and has for its objectthe more perfect formation, as well as to reduce the cost ofmanufacture.

In the manufacture of auger-bits it is essential that the lip or cutterproject slightly beyondthe body of i the anger in order that the bodymay turn with very little friction, therefore the anger at the cuttingpoint is not perfectly round, and it cannot be formed or finished in thecommon lathe. It has therefore heretofore been done by hand, filing orgrinding and finishing that part of the auger, whichis no small item inthe cost of manufacture, to say nothing of the unavoidable imperfectionarising from 'this manner of finishing. By our invention this labor isautomatically performed,and in the mostiperfect manner, and all the bitsof an intended certainsize will be exactlyalike, and the curve given tothe lip be done with mathematical precision.

In order to the clear understanding of our invention, as well as toenable others to construct the same, We will proceed to a description ofthe same as illustrated in the accompanying drawings.

A is the bed-plate, of any convenient form, supporting on a s'haftB, inbearings C, a cutting or grindingmill, D, which may be either a mineralor metallic surface, and is caused to revolve by the application ofpower to the shaft 13 in any convenient manner. In proper guides uponthe bed-plate is. arranged a car riagc, E, so as to move freelytransversely on thefsaid bed-plate, that'is to say, at right angles tothe shaft 13. Upon the said carriage in proper bearings F is'arranged ascroll or other chuck, G, through the centre of which the bit a ispassed, and clamped centrally in the. said chuck in the usual manner ofgriping articles in similar chucks. Upon the bearings H upon the saidcarriage is arranged a shaft, I, having upon its two ends a cam, L, 'andthe shaft I and the chuckG caused to revolve at an equal velocity bymeans of gearing J J, and bllefiflid cams bear against adjustable guidesK, which said guides are fixed to the bcd-plate independent from thecarriage E, so that bythe revolution of the shaft I the said carriage ismoved to or from the said guides, according to the irregularities in thesurface of the said cams, and the said carriage is held back, so thatthe cams constantly bear against the said guides, by means of a weight,M,or other convenient similar arrangement.

This completes the constructionof our machine. Its operation is asfollows:

The cams L are first formed, having a projectiomf, in the surfacecorresponding to therequired projection of the lip of the auger, and theguides K are adjusted so that .the centre 'of the chuck G is broughtinto the proper relative position to the cutter or mill D, as seen infig.'3, the cutter being denoted by the red line. The anger or bit isthen placed through the chuck to the proper position, as seen in figs. 1and 2, that is to say, so that the lip of the auger and the projectionof the cam correspond to each other, so that, revolving together, thelip of the auger will be found to correspond to the projection of thecam, and there griped by the jaws of the chuck, and, the cutter causedto revolve, cuts from the surface of the bit, which is caused to slowlyrevolve in any convenient manner. The cam L, bearing against the guidesK, holds the auger against the cutter, and both turning together, andthe projection on the cam corresponding to the lipon the auger,gradually moves the auger from the cutter as it approaches the lip, andthus forms the hit in the most perfect manner, and every bit of the samesize will be 'of like perfect form. The same cams answerforscveraldifierent-sized bits, it only being necessary to adjust theguides so that the bits stand in the proper relative position.

We have thus far described our machine as for bits or angers of a singlecutter. If for double cutters, then the cams should-be formed with likeprojections upon opposite sides, or the cams should be caused to revolvetwice to one revolution of the bit. Such adjustment would be readilyunderstood by those skilled in the use of machinery without furtherillustration; and the amount of saving by this invention over the oldhand process of finishing is too apparent to need further mention Havingtherefore thus fully described ourinyeution, what we claim-as new anduseful,'and desire to secure 'hy Letters Patent, is--.

The combination of the hit-holding device G, and the forining cams Lwith the mill or cutter D, all conatructed, arranged, and operating inthe manner and by the means substantially as herein set forth.

E. O. CARRINGTON, EDWIN OARRINGTON.

Witnesses:

RICHARD Tlms Ls', A. JQ Tnaerrs.

